Ok, my friend came over here, and then he saw that the glass inside of the display with all the contacts on it was broken. That was the reason.
Yes, I flashed sykopompos.
Well, I started now from the beginning. Flashed stock rom, then radio, now I make a reboot and it hangs in boot.
Do I need the radio?
Can I flash supersu with fastboot or do I have to flash it via recovery?
Solved! CK3100 can store up to 5 devices, I deleted one and could connect. :)
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